厚度及温度影响下重庆淤泥质土裂隙形态试验研究

doi:10.13722/j.cnki.jrme.2021.0313

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摘要土体龟裂是一种常见自然现象，龟裂的发育会显著弱化土体的结构性和完整性，从而导致工程灾害的发生。为了研究土体厚度、温度对重庆淤泥质土龟裂特性的影响，本文开展物性试验、XRF试验、XRD衍射试验、龟裂试验和扫描电镜试验，然后基于数字图像处理技术、分形理论等实现对龟裂形态的定量表征。结果表明：(1) 重庆淤泥质土属于高液限黏土，颗粒形态呈现出分散结构以及不规则的粒团形式；(2) 裂隙多呈现出“T”型及“Y”型等三岔口形式，裂隙所分割出的土块多以三角形、多边形、扇形等形式表现；(3) 各相应温度条件下，裂隙节点个数、裂隙条数、裂隙总长度、土块个数和土块总面积均随着土体厚度的增加而减少，而裂隙总面积、表面裂隙率、表面裂隙比、裂隙平均长度、裂隙平均宽度、平均土块面积和最大土块面积则随着土体厚度的增加而呈现出增大趋势，其中，裂隙长度的频率分布符合LogNormal函数曲线形式；(4) 分形维数随着土体厚度的增加而缓慢增大，而与平均裂隙宽度之间有着较好的指数关系；(5) 各相应土体厚度条件下，裂隙长度分布范围随温度的升高呈降低趋势。重庆淤泥质土龟裂形态是多尺度的，包括宏观裂隙、细观裂隙以及微观裂隙，土体中的多尺度裂隙极大地弱化了其工程性质。

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	方华强1
	2
	蒋春勇1
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	王成龙1
	2
	欧强1
	2
	龙开荃1
	2

关键词 ：土力学, 土体龟裂, 重庆淤泥质土, 土体厚度, 温度, 多尺度

Abstract：Soil desiccation cracking is a common natural phenomenon. The initiation and propagation of cracks can significantly weaken the structure and integrity of the soil，leading to engineering disasters. In order to study the influence of the layer thickness and the temperature on the crack morphology of Chongqing silt，physical test，XRF test，XRD diffraction test，desiccation cracking test and scanning electron microscope test are carried out. Subsequently，based on digital image processing technology，fractal theory，etc.，the quantitative characterization of the crack morphology is realized. The results show that Chongqing silt is a high liquid limit clay，whose particle morphology presents a dispersed structure and irregular particle clusters，and that the cracks mostly present the forms of three way junctions such as T and Y shapes，and the soil clods divided by the cracks are mostly in the forms of triangles，polygons and sectors. Under the corresponding temperature condition，the number of nodes，the number of cracks，the total length of cracks，the number of clods and the total area of clods all decrease with increasing the layer thickness，while the total crack area，the surface crack rate，the surface crack ratio，the average length of cracks，the average width of cracks，the average area of clods and the maximum area of clods show an increasing trend with the layer thickness. In addition，the frequency distribution of the crack length conforms to a LogNormal function. It is also indicated that the fractal dimension tends to increase slowly with increasing the layer thickness while has a good exponential relationship with the average crack width，and that，under the conditions of the corresponding layer thickness，the distribution range of the crack length shows a decreasing trend with the temperature. The crack morphology of Chongqing silt is multi-scale，including macro-cracks，meso-cracks and micro-cracks. The multi-scale cracks in the soil greatly weaken the engineering properties of the soil.

Key words： soil mechanics soil desiccation cracking Chongqing silt layer thickness temperature multi-scale

引用本文:

方华强1，2，蒋春勇1，2，王成龙1，2，欧强1，2，龙开荃1，2. 厚度及温度影响下重庆淤泥质土裂隙形态试验研究[J]. 岩石力学与工程学报, 2021, 40(12): 2570-2583.
FANG Huaqiang1，2，JIANG Chunyong1，2，WANG Chenglong1，2，OU Qiang1，2，LONG Kaiquan1，2. Effects of layer thickness and temperature on the crack morphology of Chongqing silt. , 2021, 40(12): 2570-2583.

链接本文:

http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2021.0313 或 http://rockmech.whrsm.ac.cn/CN/Y2021/V40/I12/2570

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